# BuiltInAggregationFn

# Type Alias: BuiltInAggregationFn

```ts
type BuiltInAggregationFn = keyof typeof aggregationFns;
```

Defined in: [fns/aggregationFns.ts:261](https://github.com/TanStack/table/blob/main/packages/table-core/src/fns/aggregationFns.ts#L261)